Greg Koenig has already taken apart his iPod Mini, not two days after they went on sale. He has posted the instructions and photos at iPodLounge. Two things were interesting:
1. He destroyed his iPod, but given the lessons learned they can be taken apart safely.
2. The 4Gb Microdrive has a CompactFlash interface.
Greg says he tried the Microdrive in his compactflash card reader and camera without success, but didn't mention if he tried to reformat the card. There has been discussion at dpreview.com about using the Hitachi microdrive out of the Creative MuVo2 4Gb in cameras. The reason for this almost bizarre destructiveness is that the 4Gb drives alone are retailing at $500+, whereas 4Gb mp3 players using the same drives can be had for as little as $190.